Preparation of Ag nanoparticles-SnO2 nanoparticles-reduced graphene oxide hybrids and their application for detection of NO2 at room temperature

作者: Ziying Wang ,Yong Zhang ,Sen Liu ,Tong Zhang ,
期刊: Sens. Actuators B
卷号: 2016,222,893-903
接收日期: 2015-09-07 18:16:04
摘要 Abstract


A novel NO2 gas sensor has been constructed using Ag nanoparticles-SnO2 nanoparticles-reduced graphene oxide (AgNPs-SnO2-rGO) hybrids as sensing materials. AgNPs-SnO2-rGO hybrids were prepared by a two-step wet-chemical method. Firstly, SnO2-rGO hybrids were synthesized by hydrothermal treatment of aqueous dispersion of GO in the presence of SnCl4. Then, AgNPs-SnO2-rGO hybrids were obtained by in situ reduction of AgNO3 on the surface of SnO2-rGO hybrids. The combined characterizations of UV?Cvis spectroscopy, X-ray diffraction (XRD), energy-dispersive X-ray spectrometer (EDX), elemental mapping, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and Raman spectra were used to investigate the structure of AgNPs-SnO2-rGO hybrids. Most importantly, the sensor based on AgNPs-SnO2-rGO hybrids exhibits good sensing performance for NO2 sensing operating at room temperature. For example, the response time and recovery time of the sensor based on AgNPs-SnO2-rGO hybrids for 5 ppm NO2 are 49 s and 339 s, which are much shorter than that of SnO2-rGO hybrids (415 s and 740 s), indicating that the sensing performances for NO2 sensing at room temperature have been tremendously enhanced by introduction of AgNPs into SnO2-rGO hybrids.


  • Reduced graphene oxide

  • Tin dioxide nanoparticle

  • Silver nanoparticle;

  • Nitrogen dioxide

  • Room temperature